"The primary objective of copyright is not to reward
the labor of authors, but to promote the Progress of
Science and useful Arts. To this end, copyright
assures authors the right to their original
expression, but encourages others to build freely upon
the ideas and information conveyed by a work. This
result is neither unfair nor unfortunate. It is the
means by which copyright advances the progress of
science and art".

The Copyright Law states that:

Without infringing copyright, the public has a right
to expect:

---to read, listen to, or view publicly marketed
copyrighted material privately, on site or remotely;

---to browse through publicly marketed copyrighted
material;

---to experiment with variations of copyrighted
material for fair use purposes, while preserving the
integrity of the original;

---to make or have made for them a first generation
copy for personal use of an article or other small
part of a publicly marketed copyrighted work or a work
in a library's collection for such purpose as study,
scholarship, or research; and

---to make transitory copies if ephemeral or
incidental to a lawful use and if retained only
temporarily.